bhupen Yes, this can be done, this is a custom page and not a board page, so you can make changes to this specific page easily.
For the first requirement, you can try:
Write this code in header inside the wrapper.
<#if http.request.url?contains("/t5/custom/page/page-id/heldiver")>
<@liaAddScript>
(function($) {
$(document).ready(function() {
var watermark = 'Search HELLDIVERS Forums';
//init, set watermark text and class
$('#messageSearchField').val(watermark).addClass('watermark');
//if blur and no value inside, set watermark text and class again.
$('#messageSearchField').blur(function(){
if ($(this).val().length == 0){
$(this).val(watermark).addClass('watermark');
}
});
//if focus and text is watermrk, set it to empty and remove the watermark class
$('#messageSearchField').focus(function(){
if ($(this).val() == watermark){
$(this).val('').removeClass('watermark');
}
});
});
})(LITHIUM.jQuery);
</@liaAddScript>
<#else>
<!-- other cases -->
</#if>
2. As this is a custom page, so you can add a Custom Component on the layout of this page from Studio, and keep it under the search bar, and add your description in the custom component you just created.
I hope this helps.